prologue a: hola! want to know about ‘conman’, the new interactive tool?? b: thanks, i had...
TRANSCRIPT
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Prologue
A: Hola! Want to know about ‘ConMan’, the new interactive tool??
B: Thanks, I had enough of this already. I came across enough cool ones in Dr. North’s class!
A: Not the traditional, cumbersome, hard to manage, limited usage ones that can’t encapsulate all possible cases.
B: Stop it! I love Dr.North.
A: I thought you were interested in a more dynamic, user-initiated, flexile interface…
B: Hmmph, you WIN!!!
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ConMan
A Visual Programming Language
for
Interactive Graphics
Paul E. Haeberli , Silicon Graphics, Inc.
A presentation by Ajay Jampani
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Motivation: why yet one more vis tool??
• Static user-interface reflects developer's vision
Non-user friendly at times • Users match a given toolkit to a particular task.
E.g. UNIX pipe: ls || pg, an IPC
Synergy: 2+2=5 rule in Sys Anal & Des • Same rule extended to visual tools. • User can use combinations to solve problems
that the designers didn't envision
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IntroductionConMan?? Huh?
CONnection MANager:A High-level Visual Language (run on IRIS) A Graphical facility for connecting visually-oriented tools
KEY: Disintegration into modular components, (a) Combined selectively depending on desired function
Flexible, easy to develop (b) Users dynamically build, modify graphical applications
Encourages exploration, acts as “pseudo-developer”
(c) Uses a Data Flow Metaphor
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Example
• Separate interaction frame per component
• Extending: Connect interaction frames of the applications
• Connection as easy as directing I/p and o/p s
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Mechanics
Basic unit: Component ( with code written in C lang.)(a) Developer concentrates more on a single unit
More efficient!(b) They can be combined to give better results
Better component Œ effective applications!
ConMan: Basically a user ‘process’ running under window mgr
Message Passing used to communicate
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Why Visual Programming?
Visual Programming
• Describes any sys that lets user specify a prog using a 2D notation (representation)
• Easy to use and manipulate
• User has more freedom
• Effective Tailor made applications in less time
• Easy to undo/redo, effects rendered instantly
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An Example- AVS
Why AVS (Advanced Visualization System)?
Tools like AVS use a visual programming approach based on Haeberli's ConMan, enabling people to link together various components to build powerful scientific / technical visual applications without going through the process of learning
Some practical uses:
Facilitates analysis and treatment of prostate cancer; can simulate placement of seeds within the patient's anatomy and vis results
Data processing and Vis Networks etc
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Features
Features:
Provides traditional plots and graphs, 3D interactive rendering and volume visualization, simple interfaces
Wide usage: Most Common application areas, wide range of functions supported (simple SQL to very complex db ops)
Interoperability: Huge repository of user-contributed modules, various formats, Cross-pf visualization, Application deployment with no recompiling and no changes to app code;
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Sample AVS screenshots
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Advantages
• Wraps most frequently used vis techniques in intuitive, easy-to-learn "viewers"
• Explore data immediately: no programming experience
• Scales to very large data and very complex systems 0.5m modules/application
Yet easy: Visual programming environment
• Visual environment reduces error rate on user’s part
• More interactive and modular applications
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Disadvantages
• Assumes user can handle tools provided to him effectively
Inherent weaknesses of user reflected in his work
• Difficult to build large scalable systems
• But again, such tradeoff (Expressive Vs. Ready-made) benefits only some users, while others are left unsatisfied
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HCI Metrics
• User Retention:
• Learning Curve: • User Satisfaction: • User Performance:
• Error Recovery:
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QUESTIONS? COMMENTS??
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